Figure 3

Plasma progesterone concentrations in cycling sheep at a high altitude. Progesterone profiles were determined during the entire non-conceptional reproductive cycle (panel A) in sheep at a high altitude that were either unsupplemented (HH: high-altitude natives; LH: low-altitude natives) or supplemented daily (HHV: high-altitude natives; LHV: low-altitude natives) with vitamins C and E. Groups LL and LLV correspond to the control cycling sheep at a low altitude without and with vitamin supplementation, respectively. Panels B and C represent the progesterone group averages during the early (days 1 to 6 after ovulation) or late (days 7 to 12 after ovulation) luteal phase of the same reproductive cycles. The different letters above columns indicate significant differences among groups (P<0.05, Duncan`s test).